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Myriophyllum simulans – Amphibious Water Milfoil non-native
Species, Flowering plant, Freshwater, terrestrial
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Myrrhis odorata – Sweet Cicely non-native
Species, Flowering plant, Freshwater, terrestrial
Gwyn y Dillad, Creithig Bêr, Creithig, Cegid Wen, Cegiden Wen, Cegiden Bêr, Sisli Bêr
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Najas graminea – Naiad non-native
Species, Flowering plant, Freshwater
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Nuphar advena – Spatter-dock non-native
Species, Flowering plant, Freshwater
Lili'r-Dŵr Felen Ddeilsyth, Lilïau'r-Dŵr Melyn Deilsyth
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Oenothera biennis – Common Evening-primrose non-native
Species, Flowering plant, Freshwater, terrestrial
Lesser Evening Primrose, Briallu yr Hwyr, Hwyr Friallen Lleiaf, Melyn yr Hwyr
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Oenothera cambrica – Small-flowered Evening-primrose non-native
Species, Flowering plant, Freshwater, terrestrial
Melyn-yr-Hwyr Mân-Flodeuog, Briallu yr Hwyr Cymreig, Melyn yr Hwyr Cymreig
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Persicaria campanulata – Lesser Knotweed non-native
Species, Flowering plant, Freshwater, terrestrial
Y Ganwraidd Fach, Clymlys Lleiaf
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Persicaria wallichii – Himalayan Knotweed non-native
Species, Flowering plant, Freshwater, terrestrial
Y Ganwraidd Himalaiaidd, Clymog yr Himalaya
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Petasites albus – White Butterbur non-native
Species, Flowering plant, Freshwater, terrestrial
Alan Bach, Alannon Bach
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Petasites fragrans – Winter Heliotrope non-native
Species, Flowering plant, Freshwater, terrestrial
Alan Pêr, Alan Mis Bach, Alannon Pêr
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Petasites japonicus – Giant Butterbur non-native
Species, Flowering plant, Freshwater, terrestrial
Creamy Butterbur, Yr Alan Mwyaf, Alan Gawr, Yr Alannon Mwyaf
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Peucedanum ostruthium – Masterwort non-native
Species, Flowering plant, Freshwater, terrestrial
Poethwraidd, Ffenigl-y-Moch Gwridog, Pelydr Gau Ysbaen, Dyfrforonen Sypflodeuog, Llysiau'r Ddannodd, Llysiau'r Ddannoedd, Sinsir y Gors, Poerlys
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Pistia stratiotes – Water-lettuce non-native
Species, Flowering plant, Freshwater, terrestrial
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Poa palustris – Swamp Meadow-grass non-native
Species, Flowering plant, Freshwater, terrestrial
Gweunwellt y Gors, Gweunwellt yr Afon
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Pontederia cordata – Pickerelweed non-native
Species, Flowering plant, Freshwater, terrestrial
Picrelys
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Proserpinaca palustris – Marsh Mermaidweed non-native
Species, Flowering plant, Freshwater, terrestrial
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Rhododendron ponticum – Rhododendron non-native
Species, Flowering plant, Freshwater, terrestrial
Rhododendron Wyllt
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Rumex cristatus – Greek Dock non-native
Species, Flowering plant, Freshwater, terrestrial
Tafol Groeg, Tafolen Groeg
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Sagittaria latifolia – Duck-potato non-native
Species, Flowering plant, Freshwater
Duck Potato, Saethlys Llydanddail
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Sagittaria rigida – Canadian Arrowhead non-native
Species, Flowering plant, Freshwater
Saethlys Canada